Both HP2551 and the GW-1000 will show up as separate devices on the WS-View app and as separate data sources on Ecowitt.net if that's what you are asking.
Your HP2550A has live data on the WS-View??? I'm not aware that the HP2551/HP2550A/WS-2000 is capable of displaying live data on the WS-View app in the same manner that the GW1000 does. I don't own the HP2550A so I'm just asking for confirmation.
For those curious what the difference is between these:
HP2550 = Fine Offset model name
HP2551 = Ecowitt model name
WS-2000 = Ambient Weather model name
They are all three practically the same thing with some minor firmware differences. There are also other reseller brands of the same original Fine Offset HP2550.
By live view of sensors I'm referring to this screen:
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